Discuss 40 series VS 40series delta flowmaster on AllFordMustangs.com, the place for Mustang enthusiasts.

Welcome to our Mustang forums where Mustangers come together to hang out, discuss and enjoy their favorite Mustang hobby with fellow Mustang enthusiasts. We invite everyone to read, post, and enjoy our Mustang forum as well as the many other sections of our site.

You are currently viewing our forums as a guest. By joining our community you gain access to post topics, communicate with members, upload your photos and access many other special features. Registration is fast, simple and free so why wait, join our Mustang community today! If you have any problems with registration or your account login, please contact support.

about to get my exhaust (very first mod on this car), I'm trying to decide on 40 series original or 40 series delta flow. How much louder would the original 40 series be and which would flow better..Thanks for any help.

The difference between the 40 series original and the delta flow 40 series is that the delta flow has more baffle or plate inside to quiet it down. I'm looking for an agressive sounding exhaust (not too loud ) with good flow.I guess something that sounds like a 40 series delta with the flow of a straight through muffler..

You will never equal the flow of a straight through muffler with a chambered muffler...I love the sound of my flows and have seen dyno charts with the flows welded into a stock system yield 8rwhp. I will try to find the link and post it up.